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The hardness and abrasiveness of natural materials, such as stone, vary by type, but they also vary significantly within a specific type. Most stones are not pure - they are mixtures of various types of rock. Granite, for example, contains various combinations of primarily quartz, feldspar, black mica and hornblende. Therefore, a specific stone type such as granite or marble, will vary significantly in hardness and abrasiveness depending upon the exact mineral composition that varies by quarry location. For example, river sand is much less abrasive than quarry sand.

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Diamond hole saws are designed to drill holes in glass, ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and fiberglass.

Exchange-A-Blade diamond hole saws are market leaders in quality and value. They can be used to drill holes in glass, ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and fiberglass. They are available in a variety of sizes and come in a Professional Bronze Line and an Economy Green Line. All Exchange-A-Blade diamond hole saws come with a drilling template for accurate results.

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The cutting speed and life of a diamond hole saw are affected by the hardness and abrasiveness of the material plus the drill speed, pressure and lubrication. Experience with a specific material quickly allows a person to determine the optimum drill speed, pressure, and lubrication to obtain the fastest cutting speed with the least effect upon hole saw life and risk of heat fractures or breakage. However, when experience is lacking, it is best to start out with a very slow drill speed, very low pressure and lots of lubrication. This starting point reduces risks to a minimum and extends hole saw life considerably.

Below is a table of the hardness of various materials. The table uses the standard Knoop Hardness Scale (kg/mm2). The hardest known material is diamond, with a Knoop measurement of 7,000. Tungsten carbide, used in carbide hole saws, is the hardest natural material next to diamond. However, with a measurement of 2,000, tungsten carbide is only 30% as hard as diamond.

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© 2024 EAB Tool Company Inc. All rights reserved. All registered and unregistered trademarks are the property of their respective owners.

Materials have varying degrees of hardness and abrasiveness. Additionally, specific man-made and natural materials can differ greatly depending upon their exact physical compositions. For example, glass varies in hardness depending upon colour and type, since various metals and minerals are added to achieve the different types and colours. Glass also has differing degrees of "temper" depending upon the specific manufacturing methods used.